As data “flows” into a stream listener tee, it is copied to the output stream
and then forwarded to the real listener.
Initalize the tee.
| listener | the original listener the tee will propagate onStartRequest, onDataAvailable and onStopRequest notifications to, exceptions from the listener will be propagated back to the channel |
| sink | the stream the data coming from the channel will be written to, should be blocking |
| requestObserver | optional parameter, listener that gets only onStartRequest and onStopRequest notifications; exceptions threw within this optional observer are also propagated to the channel, but exceptions from the original listener (listener parameter) are privileged |
Initalize the tee like above, but with the extra parameter to make it
possible to copy the output asynchronously
| anEventTarget | if set, this event-target is used to copy data to the output stream, giving an asynchronous tee |